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Brookings Municipal Utilities

Sewage treatment plant, major discharger, Brookings, South Dakota. NPDES permit SD0023388 expired Sep 30, 2013; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (38 values), form W quarterly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (108)

ParameterStatisticLimitMonths
Temperature, water deg. centigrade30-day averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Oxygen, dissolved [DO]daily minimum≥ 6 mg/LJan, Feb, Mar, May, Oct, Nov, Dec
Oxygen, dissolved [DO]daily minimum≥ 5 mg/LApr, Jun, Aug, Sep
Oxygen, dissolved [DO]daily minimum≥ 5.5 mg/LJul
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 354 lb/dJan
BOD, 5-day, 20 deg. C30-day average≤ 350 lb/dFeb
BOD, 5-day, 20 deg. C30-day average≤ 933 lb/dMar
BOD, 5-day, 20 deg. C30-day average≤ 1560 lb/dApr
BOD, 5-day, 20 deg. C30-day average≤ 1475 lb/dMay
BOD, 5-day, 20 deg. C30-day average≤ 570 lb/dJun
BOD, 5-day, 20 deg. C30-day average≤ 443 lb/dJul
BOD, 5-day, 20 deg. C30-day average≤ 423 lb/dAug
BOD, 5-day, 20 deg. C30-day average≤ 636 lb/dSep
BOD, 5-day, 20 deg. C30-day average≤ 1011 lb/dOct
BOD, 5-day, 20 deg. C30-day average≤ 505 lb/dNov
BOD, 5-day, 20 deg. C30-day average≤ 749 lb/dDec
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 354 lb/dJan
BOD, 5-day, 20 deg. Cmaximum 7-day average< 350 lb/dFeb
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 933 lb/dMar
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 2340 lb/dApr
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 1868 lb/dMay
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 570 lb/dJun
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 443 lb/dJul
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 423 lb/dAug
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 636 lb/dSep
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 1180 lb/dOct
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 505 lb/dNov
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 749 lb/dDec
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Alkalinity, total [as CaCO3]30-day averagereport only (mg/L)all year
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year
Solids, total suspended30-day averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day average≤ 148.8 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 147.2 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 140 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 88.4 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 83.6 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 38 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 29.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 28.2 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 50.9 lb/dSep
Nitrogen, ammonia total [as N]30-day average≤ 40.5 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 173.9 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 157.2 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 177.1 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 175.3 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 213.9 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 161.2 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 152.4 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 72.2 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 56.1 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 53.6 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 89 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 70.8 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 210.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 212.1 lb/dDec
Nitrogen, nitrate total [as N]30-day averagereport only (mg/L)all year
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]30-day averagereport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Copper, total recoverable30-day averagereport only (mg/L)all year
Copper, total recoverabledaily maximumreport only (mg/L)all year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Coliform, fecal general30-day geometric mean≤ 1000 #/100mLMay–Sep
Coliform, fecal generaldaily maximum≤ 2000 #/100mLMay–Sep
Coliform, total general30-day geometric mean≤ 5000 #/100mLall year
Coliform, total generaldaily maximum≤ 20000 #/100mLall year
BOD, carbonaceous [5 day, 20 C]30-day averagereport only (mg/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Hydrocarbons, total petroleumdaily maximum≤ 1 mg/Lall year
Oil and grease visualdaily maximum≤ 0 N=0;Y=1all year
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 70 %Jan
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 71 %Feb
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 53 %Mar
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 33 %Apr
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 41 %May
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 42 %Jun
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 41 %Jul
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 38 %Aug
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 57 %Sep
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 44 %Oct
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 48 %Nov
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily minimum> 52 %Dec
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 70 %Jan
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 71 %Feb
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 53 %Mar
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 33 %Apr
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 41 %May
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 42 %Jun
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 41 %Jul
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 38 %Aug
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 57 %Sep
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 44 %Oct
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 48 %Nov
IC25 Static Renewal 7 Day Chronic Pimephalesdaily minimum> 52 %Dec

How strict are these limits?

Cited limits by parameter: South Dakota's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0023388 · MCP: https://passage-data.com/mcp